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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851b34b4abcda7e31987420f2d197572850c34dc4125986cd3bf8b7dd7804992' 
  AND token = 'AqJuuQM68XFAv42+vU209tdvAPAZXCGg0HEoTLafYpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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