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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe01307592b60b6bee1eee6e82dcdab19ac0c44f383d44da9bb714c81fbe76d' 
  AND token = 'SRXWefQJwBw38HQzVys/J+fYXRkG1b0dbVzFc3LL6SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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