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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2c04ca1db197d46775eec0ff4e68880e0ef6c0e248a7499d43064f7e96604f' 
  AND token = 'tS+H/cJxYYuZs5swMfKJHGpDFPyYJGJxruVOk+1+JNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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