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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637093e414c104f7e14a94c10e5a033e87fe8ede96adf78dc648ee74f5720cb8' 
  AND token = 'B+nN0ftpZ8kD1shHDE8UgWYWlGKTSAnt3+2pgXLD4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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