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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdcda326c9f2634df0f6f24cff62cd64f261431d9fafe9a05a9fd014fbfa05f' 
  AND token = 'iG/1/L43tx+k/bnC/EFRitWVFLXw8Pg3fb+NzQhLPsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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