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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421b286d9c5c95ea93d269016c81bdd6b2783ce370836286aab68b2fc2def693' 
  AND token = 'kSTkAS0g16r4ydGwdC1i7unFshVRffI6T3S7pljRdtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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