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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f0b74ea2d57ca3ad2d6849a1d485359ef79c2ee266cdbf62c7373483b6f073' 
  AND token = 'NJha9mSC8d/G37jNEPPFbK6ZHjsJHn+I+fWnwHk6pbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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