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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f035867e7033dd574237b3f29bea3d90e047132f9582e57b17fa17920c2cf2a' 
  AND token = 'Fz3llllB2PoJMf3IOjFHpb+LlRFbPvKGAWWBF6vpnlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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