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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9789cb1ee145c5477a2cb679c1eccdbb116a313f871aab8af9fad53a0e8f8f58' 
  AND token = 'HAaSHb34XwtyIBj0qavdETyKk5KrRdXmKG/Gq+nL56g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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