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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f62cd8fa2365cce6c5405b264e9a69d1d2ee849ac31a26d35acc7db57596dd' 
  AND token = 'WoGcFdAr/oMI2DEe4LIZlvrx8AXY4GobvmUqZSqCdeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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