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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f589cf3d3597577270c11a88437352190f5e4b2513a272d1548268dfcd37c774' 
  AND token = 'PEoBUIMPbOobSKLzWSyA8NlyxUnnxWGQIHc1rCPgdn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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