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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e3f522e468e130d5417dd1498f16d49fff7db4f8aaed7fd66f3b1b585862c0' 
  AND token = '1uRuFCjnHRiBhEoC81SRYJiFJFKxNhALf/fN4GFRgas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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