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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2f0f95916438246ecbb3976e9aae502a3db99a3a4e9d79977495d8375478a2' 
  AND token = 'sGrIhdl7uT1hr2yV7LB1UPfkDtZERmr2axyIj3YvLyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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