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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26b8f06ab5d3ab59750bf4b1760a25844e35e911ea27116b49043f3a5f5af0e' 
  AND token = 'WwrD6aUm8O1skXMx9mDjJn61jWbICgqWN0U6Kngiqc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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