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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6beffac1be70fc02b1949494b3d7316b81d3f431d9f3b7b0f1bde47e3e8acce' 
  AND token = 'C5kNXkKwYFNLDF5I5H4nx+ljeKPUql/p9PssAaPQJzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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