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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470e7847d9f9d67fed3106c6df04bf34ea707606a3626c10d1d72cc7643eb486' 
  AND token = 'UlgeJ3/qPHWID+MdB2XRmV0AkLpWrpzNZAxGDqDtl3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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