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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c210e167d281b0c1c093cbc7db18e9950c4acd6c962954967a82bd7d431f8a1d' 
  AND token = '+y5tLf9ToW98MXzZBgly5+yur7XWpivDsXEeEcIy4QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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