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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd438b2a8bdcf54cdef42134e9df852cd60ffa3d598e905a662a7d0b7275017' 
  AND token = '+ZXtWwWkS13iZJTZOFQN1Uc0h3zLauP39L1GIma5/D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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