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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32100183e7835f9fc110d64e4157e03a9327c801b0f68ad076ff6f9083e6cac' 
  AND token = '+Zq8wKmF3YWrk57uknwzzNcbyEFr5OWbM8R/ZNAfuhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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