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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8b1a4889ca6c81589ab68da57bb5898ca6e6b7466ce82bd04180769a57091e' 
  AND token = '61Viq5VfaGFg+XyqoufK5k4vdv5WtcCMS6MjQnfAyDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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