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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d900c1c5a22992f2dc8a24e58e7367187c4f45ede2c0dcda4f10ccf7a996d3e' 
  AND token = 'EOogyMrRNyg1E7cRpHsheb1uGlnljJg3rOd9FFlsTwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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