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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac879e83d75dbaae68feb6e9f5e4870e278fe1c7100e43690ef4be286a0aa09' 
  AND token = 'b1MQuaoCTqLbxunimHZdSq4JfCzKtGhxgg/bJ1de5Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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