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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eae4350b3c367380d3e542913872b59cfcecd3035005e58620b422783a99f69' 
  AND token = 'wMAKgubMRr4AHP5LKWazlJHUNR/eW3hy4lDdxCWs2Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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