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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef79725b10f5370450f0d6a79ffb22d2c17fd471ef7f1934f76ca38808e5567' 
  AND token = 'Ypm2A9C0uBBLUfhStaEsKcwGczBqAfowigKGinfqoN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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