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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b405ff9ac179c1273fbca7b25752ba170977b2f5f81476a0ec3b2b28b163974' 
  AND token = 'PC0rRw+2y8rWT4R5FRqD85Tp3zb05HcQYQ0mE/snIRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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