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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102d2be39e2c8a163aa3108d1f00d848f4bf66c49cda65891faeef94d3f869c2' 
  AND token = 'hGltcjgiHC9/UT857sRA3iHzG4HEJJyO+OEYm4+P528=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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