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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0819aa3a139175530e13341ccd8f411587f02c6ab1ef5ad474eb539a31cfcef2' 
  AND token = 'mQT81lcOIy+W6SlUOaOIrRoLC6anIcWyxKdc3MPnX64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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