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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bc40330c430e16655d5b0ad96a2494d85541fecc2b9ce9a20bb655639ea017' 
  AND token = 'VEJDjKlmjbPZ8csAh2Pd8jy21JQs1ubCIaMemK34pCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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