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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e203b24d28be7afaaa2e4805d34feb3a4c57f36fe805a5fce3fe20b139694790' 
  AND token = 'fS6vV+2MgMd68PCS+s9WUtEYFuWVo7yIYopsHGVya7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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