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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbf8ed147a51849d4f3adf33b9246ef3fcbc212507c75888d71566f8caf83c0' 
  AND token = 'kzfbtiegLA9hGMV7VmkArbFe3oXX9e7rXaB4nvt4AgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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