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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31d3f734be2b096ed35319d31cf5adecfba446b48c092690f9fb25664fd1edd' 
  AND token = 'HvMRS7hXfRPRPqTLGtHoEGI6iak+P90Gxkk+Gm6dti4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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