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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7fcbae0c40741488e8596496cd9c6da7d92c32ae5c3bc8f486fe8d862119ae' 
  AND token = 'RNGJROfFC0P3WwTiq0uUuyNJdY/LuLbuOthtK7lJCFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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