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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea1010e342755425e8cd4da4f778c2fc86a8c21d7b7e4c1ec8c8c149c56ecb5' 
  AND token = 'FKZLhAXUEmTe92IQEd+iJ7V1s4Xh8JPdUU9IHRejEYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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