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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39469bcb8a509589b4ecbefa7d3d265832662754764a055d1c1a09fbdddc10e5' 
  AND token = 'LGrGdjNJiX50neoh0uuDPV6WLEy39aa/RVSNsFHeDfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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