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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83e0cb511cb745ad74cafac5f190daf0f2e0b188ad18c6e63789acdd782a0bc' 
  AND token = 'StKzS60quNgaqr/SLoorFGIcAvpGH2MBM7589XkDSnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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