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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ffd25da862e9b0be20ec2d4cfe330d04f55878cca8d32e1fcda251afea467c' 
  AND token = 'rusdjEEzoSIuFbfD2SWWnceq+1M/rXP+KI/vboHcvrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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