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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aae503fa17a2b9a16c3bc1b0288bed5bb84ee193d3275a78d1e5ad5d4c30bee' 
  AND token = 'a5W2B7Y9n0a8ykuGAin6wfhQvLcf50+O3jl6Nk1gHFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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