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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2899c53da56caf0ad3ee64ab9b388ed1a72ab9dffbaf9537b08a5ad25f0f6216' 
  AND token = 'LvaBFOth8o5dQ7asabh0EiMtR/qd8Iz16Jur0G1GHe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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