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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35076e929d7b0bbc58fd5371d6528fe7dc061b3a9a526d4ee3b503dfe817115' 
  AND token = 'H4tLbxRlx+TT1EX4chxz4oVtZE3SgGxb2wsjX5wWpuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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