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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0279538f036114c95c8b6a4dc9570a38ef5c849308ca6f6401633ff8c9d87b2' 
  AND token = 'F0wbMyf2BzWHRd4L6OsL5Wgzgy7MGcQx5bjoSfJ5xLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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