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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9cdfb013424ee52b27cce1d19605b30e25a9e2de1f392abb90272166283098' 
  AND token = '2R0dO4TT7HyOs5NUrJaX88WcDs/ZoNi0iVJPRL6iRdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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