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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0355f85f2e9fcb7160fafb986bd8453e219b7031dcbe02acb23db0ca50aaac81' 
  AND token = 'Pudg/E4w2GEqbPx2GX56/nk07fAsVeOtafZWpQCmbLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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