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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2682587aa0fcb98e5420efdc16ec0855ef7574be95f7be1ee0b0a2f34100279d' 
  AND token = 't/i4xVDwObMH5nLo3FBdtQV8zE/tV95TaZP9MYxT+Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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