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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b09403d4df69e50e0c8e3a8c835636c83500376d84d07a90cffcbe91290b2e8' 
  AND token = '/Tf8JejGYdR7MvQD1DIeXwluMmLLAQDmI++UtFX/s7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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