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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3f7a7c0fb49d707f7f8393b72ebfcc2c3495cf19dc390b9239cf2b0ceab2bd' 
  AND token = 'm6gaH2HMREhU+n3GfhT47kj8ekkHBgRDe7AeyqaGa1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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