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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071f0e857e3e61b19c408ecb30048a1e34916b7e8b301de79a801ba0abfb0d9e' 
  AND token = 'a/sssiWlW8wfCOvPfpGUAGVLcWFj1v+0A17QanwAOD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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