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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb1818e4e30ad8c1072ce62b29689f76f775aa3f8a2f51e62df3ed8d097f3f5' 
  AND token = 'EyPU3upJ5edIj80U0otIBJKdG5rlsUzMaUSlnf2RrjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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