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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b1e06a527f9799cf0fe527f66d8c8bc9fa1244bcfdc58de90cbd23aa57c95b' 
  AND token = 'XV1feLZ7kuDYWvcn5eMEfE5Pxdp88YDVvmSue16WdGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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