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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0aba3e587145384e82dc16dacb2e151caad32a1280c4bf779342701be8676b' 
  AND token = '3vFGms11/ENS0BcoeJOnqkV2iUji87NwltQXfmpkwVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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