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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84904ada30233cd64378e8179f9ff4afd22d77a81cdde814368a7832487b4039' 
  AND token = 'Jp8mfFCRAUnzlbUlxPUAQsbrSNtHcl+J0/G5yJvdJZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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