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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6b1de1810ec23e0890e1fe8ae33926e1e02c9bbb82f3ca71d3d4192187d7a5' 
  AND token = 'qetrPjhxcXmnunP3rLchyZ323gr3v1gat+8gbxEB2R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}