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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4b8974f4e0d26a032fce64ad189828b896e9bd5481b6a248327e319967f3d4' 
  AND token = 'L/2FC7UZ4NBWtkz2xTskWWL5GUtvwJuEbB1KAOQQXr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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