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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3a766d35808cb778406c58cc2a98d89f436e8e2fe716cce56bb3a6feb17dc8' 
  AND token = '/Sr7YxWtkBbuYrc5/1vEZ1Hsl5cfY7aWTYS/0I2bW/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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