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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b84d962e124f936cb71b4aadc5c07b6309253c9a9fe24a2acc8171d064fb03' 
  AND token = 'YzFBgSKLkcFMfyvKO4q8Av0EW3U8YGlgQ73H22owEyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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