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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0322af3d751db777a2b65ff0bc70d5054f8473468e30d32f53571cb0535528b7' 
  AND token = 'OcTOFDPjWnvn2owC2X+cM6tn1HzwD4/txp68/OHUvvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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