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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63175f6c012f89aa4a5b08cdb1b8a181020b32ab2e929f62d774a950dbbb9a9' 
  AND token = 'OSv0CemFtuXlVj4jbgR0EgzmCi5hSqRKwV4NEw36je4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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