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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900011d42a45fc1ba67a767edce3d46c7495499da45b73689d5a8dd0f469dc4c' 
  AND token = 'aVw7kqAOfW6ts1Kn/g/2N8z1LOSPh4ZEGGkQb6/89n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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