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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd238d57fb91d9831542fb0c5a7f6f19c438650fd82dae6562d96842cadcd9232' 
  AND token = 'o3koTPHhg/2NdOlkFlfGbfWzvvCdDRfNanpGgEe9j/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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