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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ead937d424a1c691faa67c24dc7bec5fef310f76784cf22fedc17fd25862c3' 
  AND token = 'GHnT0Ujd3tTExoE1MRCxifSBOs8ASc+z/W0siNFDiJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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