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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec739fc963b87f43752ffe469757bdd41a9591a14b58d775dbac435758dea8a' 
  AND token = 'EBMhN3kFh/ANdUBCvjhHKYcHRs2TzlBFLpSrUlLK7TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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