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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb638e48883bf4ef784efe928b43a13dafc1f103a1837a3316d5577682a997f' 
  AND token = 'G3p8nHlZ1b4yd4NM5+SxPQTa3BZ3DCbd4AJS7nON93s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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