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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545a2ed4e10bce02d46704ade079c5a5f5fe1126df653037c7599da130e000c2' 
  AND token = 'vq3hZjCr7nZtGALiFfzmhVWTwIM46tGdyBCKfrSWQIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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