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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be186fc9889407410bc69262a04e01ef476e29b73badbb0d1115496c0814d9d3' 
  AND token = 'uauaNC9mVeJnM2rF2kiUxpKBgMX1tvug561l/TWVrak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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