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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fae033585c4882aa713426c7dffc366635679cba6f4c74c9baa4f1eb36365c' 
  AND token = 'xlRKqTqO2Yu8qSx01zYZetlL5H2gAeltSyt/bk61POM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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