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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834746dfe05aafbf2395cfdea80a966b1bc3adc2e911b753be410fac1fb0cf3c' 
  AND token = 'K1Vz/P14whebXW+dkWDFrFkYrf5mExkMz2HON8KkT64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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